JP6232459B2 - Absorbent articles - Google Patents

Description

  The present invention is an absorbent article mainly used for sanitary napkins, vaginal discharge sheets, incontinence pads, toiletries, etc., and more specifically, diffusion of bodily fluid inside the absorbent body on both sides of the body fluid discharge area The present invention relates to an absorbent article provided with a body fluid diffusion suppressing structure.

  Conventionally, as an absorbent article such as a panty liner, sanitary napkin, incontinence pad, a liquid-impervious back sheet such as a polyethylene sheet or a polyethylene sheet-laminated nonwoven fabric, and a liquid-permeable surface sheet such as a nonwoven fabric or a liquid-permeable plastic sheet There is known an intervening absorber made of cotton-like pulp or the like.

  Such an absorbent article is formed in a substantially vertically long shape. In particular, the absorbent article has a wing-shaped flap that is folded back so that the crotch portion of the underwear is wound when attached, and is fixed to the outer surface of the crotch portion of the underwear. In a so-called night sanitary napkin equipped with a hip hold flap for preventing lateral displacement of the absorbent article and leakage of bodily fluids, the width dimension so as to cover a wide range from the front side to the buttocks side of the wearer's crotch In contrast, the longitudinal dimension is longer. Therefore, there is a problem that leakage from the width direction having a short dimension is likely to occur although there is a sufficient margin for liquid absorption in the longitudinal direction. That is, the body fluid absorbed by the absorbent body diffuses inside the absorbent body and easily reaches the edge (side edge) in the width direction, which is shorter than the longitudinal direction. Side leaking was easy to occur.

  As a technique for preventing such side leakage, in Patent Document 1 below, the leakage prevention sheets are arranged on both the left and right sides of the surface of the absorbent article, so that A pair of hydrophobic regions are formed inwardly from the edge, and the hydrophobic regions have continuous or non-continuous leak-proof grooves formed along the longitudinal direction of the absorbent product. Is disclosed.

  Further, in Patent Document 2 below, a water-repellent side sheet is bonded to each of both sides in the longitudinal direction of the surface sheet, and the side sheet has at least a skin contact of the absorbent body in a cross-sectional view along the width direction. A double leak-proof structure is formed from the side sheet and the leak-proof wall at the excretion part-facing part, which is disposed across the side surface from the contact surface side and is disposed opposite to the liquid excretion part of the wearer at the time of wearing. An absorbent article is disclosed.

JP 9-168563 A JP 2007-215913 A

  In the absorbent article described in Patent Literatures 1 and 2, the side surface of the absorber is provided by disposing a leak-proof sheet or a water-repellent side sheet from the back side to the front side so as to wrap around the side edge of the absorber. The body fluid absorbed by the absorber diffuses through the interior of the absorber and reaches the side edge of the absorber, so that the wearer can observe the diffusion of the body fluid after use. When it was seen, there was a case where the wearer felt anxiety that it seemed to be leaking visually even though it did not actually leak.

  Further, in the absorbent article described in Patent Document 1, the leak-proof sheet is formed by folding the back sheet up to the surface side so as to wrap around the side surface of the absorber, and is generally more rigid than a nonwoven fabric made of a plastic sheet or the like. Since the high back sheet extends to the surface side, the wearing feeling may be deteriorated. Moreover, after manufacturing a sanitary napkin without a groove, the surface sheet, the leak-proof sheet and the absorbent body are integrally compressed from the surface side along the longitudinal direction of the sanitary napkin with an embossing roll or the like, thereby preventing the leakage prevention. Since the groove is formed, the absorbent body of the groove portion is easily peeled off from the surface sheet and the leak-proof sheet due to the twist of the absorbent article at the time of wearing, which deteriorates the wearing feeling and prevents body fluids. There was a risk that the leakage effect would decrease.

  Further, in Patent Document 2, a water-repellent side sheet is bonded to each of both side portions in the longitudinal direction of the surface sheet, and the bonded portion between the surface sheet and the side sheet is peeled off by a twist or the like of the absorbent article. When the crepe paper surrounding the absorbent body that is easily torn by absorption of body fluid is torn by the twist of the absorbent article, there is a problem that the effect of preventing side leakage by the side sheet is lowered.

  SUMMARY OF THE INVENTION Accordingly, a main object of the present invention is to provide an absorbent article that reliably prevents side leakage, makes it difficult to visually cause anxiety about side leakage, and enhances the wearing feeling.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorber is interposed between the liquid-permeable surface sheet and the back sheet, and a second is provided between the liquid-permeable surface sheet and the absorber. In the absorbent article in which the sheet is disposed,
A slit penetrating in the thickness direction along the longitudinal direction is formed on each side portion of the absorbent body including the body fluid discharge portion corresponding region, and the second sheet is disposed along the inner surface of the slit. And a concave groove in which the second sheet and the back sheet are integrated in the slit,
In the second sheet, at least a portion forming one side surface of the concave groove has water repellency, a portion forming the concave groove on both sides has water repellency, and a portion located between these portions It is composed of a continuous sheet straddling the slits on both sides having hydrophilicity, or a water repellent sheet disposed in each of the slits on both sides and a hydrophilic sheet positioned therebetween are joined and integrated. An absorbent article comprising a sheet is provided.

  In the first aspect of the present invention, slits penetrating in the thickness direction along the longitudinal direction are formed on both side portions in the longitudinal direction including the body fluid discharge portion corresponding region of the absorber, and the second sheet is A concave groove is formed along the inner surface of the slit, and the second sheet and the back sheet are integrated in the slit. At this time, since the second sheet has water repellency at least at a portion forming one side surface of the concave groove, the body fluid that diffuses inside the absorbent body by the second sheet having water repellency is formed in the slit. It is dammed and it is possible to suppress diffusion from the slit to the outer side in the width direction. For this reason, side leakage of body fluid can be surely prevented, and when the wearer sees the diffusion state of body fluid after use, the absorbent body in a fresh state where body fluid is not diffused outward in the width direction from the groove Since the portion remains, it is difficult to visually feel anxiety about side leakage.

  Further, in the concave groove, the second sheet and the back sheet are integrated in the slit, so even if the absorbent article is twisted at the time of wearing, the bonding between the second sheet and the back sheet is difficult to peel off, and the wearing feeling is enhanced. In addition, the leak-proof effect can be maintained.

In the case where the second sheet is formed of a continuous sheet straddling the slits on both sides having portions having water repellency at the portions forming the concave grooves on both sides and having hydrophilicity on both sides, The diffusion of the body fluid is suppressed at the portion having water repellency, and the penetration of the body fluid absorbed by the absorbent body from the liquid-permeable surface sheet is promoted at the portion having hydrophilicity therebetween. Moreover, since the said 2nd sheet | seat is comprised with one sheet | seat, the handling in the manufacturing process of an absorbent article becomes easy. As the second sheet of this example, when a non-woven fabric made of synthetic fibers is used, the water-repellent part can be constructed using the water repellency of the material itself, and the hydrophilic part is made of a hydrophilic agent. It can be constituted by applying a hydrophilic treatment such as coating.

Further, examples of the second sheet, when constructed in accordance with the sides of the joint sheet which is integrated by bonding the hydrophilic sheet located water repellent sheet and between them disposed in each of the slits, respectively Depending on the portion, a material having water repellency or hydrophilicity can be used, and the water repellency region and the hydrophilic region can be easily formed.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the second sheet has a water repellency at a portion forming the entire inner surface of the groove.

  In the second aspect of the present invention, since the second sheet that forms the entire inner surface of the groove has water repellency, the inner and outer side surfaces of the groove are formed by portions having water repellency. Therefore, the diffusion of the body fluid to the outer side in the width direction can be suppressed more reliably.

As the present invention according to claim 3 , there is provided the absorbent article according to any one of claims 1 and 2 , wherein the second sheet has a hydrophilic portion extending outward in the width direction from the slit. .

In the third aspect of the present invention, since the portion of the second sheet that extends outward in the width direction from the slit has hydrophilicity, the portion of the body fluid that has water repellency on both sides by passing through the body has a width. Even when it flows over the outside in the direction, the body fluid can be transferred to the absorbent body at the hydrophilic portion.

As the present invention according to claim 4 , in the groove, the liquid-permeable surface sheet and the second sheet are disposed along the inner surface of the slit, and the liquid-permeable surface sheet, the second sheet, and The absorptive article according to any one of claims 1 to 3 with which a back sheet is unified.

In the invention of claim 4 , the concave groove is disposed along the inner surface of the slit with the liquid permeable surface sheet and the second sheet by embossing from the surface side of the liquid permeable surface sheet. Since the liquid-permeable top sheet, the second sheet, and the back sheet are integrated in the slit, concave grooves are formed on both sides of the skin contact surface of the absorbent article. The body fluid flowing toward the outside in the width direction on the surface of the active article is blocked, and the side leakage of the body fluid can be prevented more reliably.

As the present invention according to claim 5, the thickness of the second sheet is absorbent article according to any one of claims 1-4 is 0.5~10mm is provided.

In the invention according to the fifth aspect , since the second sheet is formed with a relatively bulky thickness of 0.5 to 10 mm, the body fluid easily passes through the second sheet, is quickly absorbed by the absorber, and flows on the surface. The occurrence of side leakage due to body fluid is reduced.

As the present invention according to claim 6, wherein the slits are either in the longitudinal direction is continuously formed, one of claims 1 to 5, which is discontinuously formed with a discontinuity in the longitudinal direction of the intermediate An absorbent article as described above is provided.

In the invention described in claim 6 , the slits may be formed continuously along the longitudinal direction, or may be formed discontinuously having a slit discontinuity in the middle of the longitudinal direction. By forming it discontinuously, the slit can be made less likely to be crushed when leg pressure is applied from the outer side to the inner side in the width direction during mounting.

  As described in detail above, according to the present invention, side leakage can be reliably prevented, and a sense of anxiety about side leakage is less likely to occur visually, and a feeling of wearing can be enhanced.

It is a partial fracture development view of sanitary napkin 1 concerning the present invention. It is the II-II arrow directional view of FIG. It is sectional drawing of the sanitary napkin 1 which shows the diffusion state of a bodily fluid. FIG. 2A is a plan view of a conventional sanitary napkin, and FIG. It is an expanded sectional view of sanitary napkin 1 concerning a modification. It is sectional drawing of the sanitary napkin 1 which concerns on a modification. (A)-(C) are sectional drawings of the sanitary napkin 1 which concerns on a modification. (A) is sectional drawing of the sanitary napkin 1 which shows before pressing and (B) after pressing. It is a top view of the ditch | groove 11 which concerns on a modification. It is a top view of the slit 10 which concerns on a modification. It is a top view of the slit 10 which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Basic structure of sanitary napkin 1]
The sanitary napkin 1 according to the present invention, as shown in FIGS. 1 and 2, is a liquid-impervious back sheet 2 made of a polyethylene sheet or the like, and menstrual blood or urine (hereinafter collectively referred to as body fluid). Liquid-permeable surface sheet 3 that quickly permeates, absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between both sheets 2 and 3, and longitudinal direction on both sides on the skin contact surface side And a second sheet 6 disposed between the liquid-permeable surface sheet 3 and the absorbent body 4, and around the absorbent body 4. In the upper and lower edge portions, the outer edge portions of the liquid-impervious back sheet 2 and the liquid-permeable surface sheet 3 are bonded by a bonding means such as an adhesive such as hot melt, heat sealing, and ultrasonic sealing. At the side edges, it ’s absorber 4. Further, the liquid-impervious back sheet 2 and the side nonwoven fabric 7 extending sideways are bonded by an adhesive such as hot melt, or a bonding means such as heat seal or ultrasonic seal. wing-shaped flaps W projecting laterally through the laminated sheet portion by the sheet 2 and the side nonwoven fabric 7, together with W is formed, hip hold flaps W _B to the portion located on the buttocks side of _this, is W _B It is a so-called night napkin that is long in the back and covers the formed wearer's buttocks. In order to maintain the shape of the absorbent body 4 and improve the diffusibility, an encapsulating sheet (not shown) made of crepe paper or non-woven fabric surrounding the absorbent body 4 may be disposed.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
The liquid-impervious back sheet 2 is made of a sheet material having at least water shielding properties such as polyethylene, but it is desirable to use a material having moisture permeability from the viewpoint of preventing stuffiness. The water- and moisture-permeable sheet material is a microporous material obtained by melting and kneading an inorganic filler in an olefin-based resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. A sheet is preferably used. One or more adhesive layers (not shown) are formed on the non-skin side surface (outer surface) of the liquid-impermeable back sheet 2 along the longitudinal direction of the napkin, and the sanitary napkin 1 is attached to the body when worn on the body. It is designed to be fixed to underwear. As said liquid-impermeable back sheet 2, you may use the polylamination nonwoven fabric which laminated | stacked the plastic film and the nonwoven fabric.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. As the material fibers constituting the nonwoven fabric, in addition to olefins such as polyethylene or polypropylene, polyesters, polyamides, and other synthetic fibers, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used. A nonwoven fabric obtained by an appropriate processing method such as a method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Of these processing methods, the spunlace method is excellent in terms of flexibility and drapeability, and the thermal bond method is excellent in terms of bulkiness and high compression recovery. When a large number of through-holes are formed in the liquid-permeable surface sheet 3, body fluid is quickly absorbed, and the dry touch property is excellent. The non-woven fiber may be either a long fiber or a short fiber, but preferably a short fiber is used in order to give a towel texture. In order to facilitate the embossing treatment, it is preferable to use an olefin fiber such as polyethylene or polypropylene having a relatively low melting point. Moreover, a core-sheath fiber, a side-by-side fiber, or a split fiber composite fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be suitably used.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is composed of, for example, cotton-like pulp and a water-absorbing polymer. The water-absorbing polymer is mixed in the pulp constituting the absorber, for example, as granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate. Softwood pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used. In the case of a hydrophobic fiber, it is desirable to use a synthetic fiber that has been surface-treated with a hydrophilizing agent so as to have an affinity for body fluids.

  As shown in FIG. 2, a second sheet 6 is disposed between the liquid-permeable surface sheet 3 and the absorber 4. The second sheet 6 will be described in detail later.

In the illustrated example, the width dimension of the liquid-permeable surface sheet 3 is slightly longer than the width of the absorbent body 4 as shown in the cross-sectional view of FIG. The outer side is a side nonwoven fabric 7 different from the liquid-permeable surface sheet 3, specifically, according to the purpose of preventing permeation of menstrual blood or cage, or enhancing the feeling of touch, A side nonwoven fabric 7 constituted by using a nonwoven fabric material subjected to appropriate water repellent treatment or hydrophilic treatment is disposed. The side nonwoven fabric 7 can be made of natural fiber, synthetic fiber, regenerated fiber, or the like and formed by an appropriate processing method. Preferably, the side nonwoven fabric 7 eliminates the feeling of stickiness and prevents stuffiness. For this reason, it is preferable to use a non-woven fabric with reduced basis weight and air permeability. Specifically, it is desirable to use a nonwoven fabric prepared with a basis weight of 13 to 23 g / m ² , and silicon-based, paraffin-based, alkylchromic chloride-based water repellents, etc. in order to reliably prevent permeation of body fluids. A water repellent nonwoven fabric coated with is preferably used.

As shown in FIG. 2, the side nonwoven fabric 7 has a portion outside the intermediate portion in the width direction ranging from the inner position of the absorbent body 4 to slightly beyond the absorbent side edge to the outer edge of the liquid-impermeable back sheet 2. A pair of left and right wing-shaped flaps W are attached to the absorbent body side position substantially corresponding to the body fluid discharge portion by the laminated sheet portion of the side nonwoven fabric 7 and the liquid-impermeable back sheet 2. , to form a W, as shown in FIG. 1, which from the buttocks side (rear side) Hip hold flaps W _B to _position, to form a W _B. These wing-shaped flaps W, W and hip hold flaps W _B, respectively pressure-sensitive adhesive layer on the outer surface side of the W _B (not shown) is provided, when worn against shorts, line folding the wing-shaped flaps W, W folded on the opposite side at the RL location, as well as fastened is wound around the crotch portion of the panties, so as to fasten the hip hold flaps W _B to the inner surface of the shorts. On the other hand, as shown in FIG. 2, the inner side of the side nonwoven fabric 7 only stops covering the side edge of the absorbent body 4 and is adhered to the liquid-permeable surface sheet 3 with an adhesive such as hot melt. Yes.

[About recessed grooves]
The sanitary napkin 1 is provided with a concave groove that suppresses body fluid diffusion in the absorbent body 4 in order to reliably prevent side leakage and to make it difficult for the wearer to visually feel uneasy about side leakage. . Hereinafter, the concave groove will be described in detail.

  In this sanitary napkin 1, as shown in FIGS. 1 to 3, slits penetrating in the thickness direction along the longitudinal direction respectively on both sides of the absorbent body 4 including the body fluid discharge portion corresponding region H. 10 and 10 are formed. The slit 10 is a penetrating portion of the absorber that is provided in left and right pairs on both sides in the middle in the width direction of the absorber 4 and that does not include pulp, polymer, or the like constituting the absorber 4. The absence of a constituent member of the absorber 4 in the slit 10 means that this constituent member is not present at all or is slightly present due to spillage of powdered polymer in the manufacturing process, but the amount is extremely small compared to the surroundings. It is a small state.

  In the sanitary napkin 1, as shown in the cross-sectional views of FIGS. 2 and 3, at least the second sheet 6 disposed on the skin side of the absorbent body 4 extends along the inner surface of the slit 10. In the slit 10, a concave groove 11 in which at least the second sheet 6 and the liquid-impermeable back sheet 2 are integrated is formed.

  In the second sheet 6, at least a portion forming one side surface of the concave groove 11 is a water repellent region 12 having water repellency. The water-repellent region 12 of the second sheet 6 is continuous from the bottom surface of the concave groove 11 to the skin side surface of the absorber 4 so as to cover all of at least one side surface of the second sheet 6 forming the concave groove 11. Is formed.

  As a result, as shown in FIG. 3, the body fluid diffusing inside the absorber 4 is blocked by the water repellent region 12 of the second sheet 6, and the body fluid diffuses outward in the width direction from the slit 10. It is suppressed and is held in the absorber 4 between the slits 10 and 10. For this reason, side leakage of body fluid can be reliably prevented, and when the wearer confirms the diffusion state of body fluid after use, the body fluid is in a fresh state in which the body fluid is not diffused outward in the width direction from the slit 10. Since the absorber portion remains, it is difficult for the wearer to visually feel anxiety about side leakage.

  The diffusion state of the body fluid will be described in more detail. As shown in FIG. 4 (A), in the conventional sanitary napkin not provided with the above-described concave groove 11 for suppressing body fluid diffusion, the absorbent body 4 absorbs the body fluid. The diffused body fluid diffuses in a substantially uniform circular range in all directions centering on the body fluid discharge part corresponding area, and when the absorbent body reaches the short edge in the width direction, it can no longer spread in the width direction. When the body fluid diffuses in the longitudinal direction, a side leak in which the body fluid leaks from the side edge of the absorber is likely to occur. On the other hand, in the sanitary napkin 1, as shown in FIG. 4 (B), since the above-described concave groove 11 for suppressing diffusion of body fluid is provided, the outer side in the width direction from the slit 10 is provided. The body fluid is prevented from diffusing to the side, and side leakage can be prevented. The body fluid dammed up by the slit 10 is prevented from spreading in the napkin width direction and changes to diffusion in the napkin longitudinal direction. At this time, since the body fluid does not diffuse outward in the width direction from the slit 10, both side edges of the absorbent body 4 are kept white. Moreover, since the width | variety until it changes to the spreading | diffusion to a napkin longitudinal direction becomes narrow rather than the conventional napkin, the spreading | diffusion area | region to a longitudinal direction can be expanded and the wider range of the absorber 4 can be utilized now as a bodily fluid absorption area | region. .

  Furthermore, by forming the concave groove 11, at least the second sheet 6 and the liquid-impermeable back sheet 2 are integrated in the slit 10, and the absorbent body 4 is not interposed in the middle. Even if the twist or twist occurs, the second sheet 6 and the liquid-impervious back sheet 2 are hardly peeled off, so that the wearing feeling can be enhanced and the body fluid leakage preventing effect can be maintained.

  The planar shape of the slit 10 extends substantially along the longitudinal direction of the napkin. That the slit 10 is substantially along the napkin longitudinal direction means that the separation length in the napkin longitudinal direction at both ends of the slit 10 is longer than the length of the entire slit 10 in the napkin width direction.

  Further, the planar shape of the slit 10 may be formed by any one of the straight line shown in FIG. 1, a curved line bulging inward or outward, a bent line, a wavy line, or a combination of two or more selected from these groups. it can. Furthermore, as shown in FIG. 10, a bent portion 10 a that is bent inward in the width direction from one or both of the front end and the rear end of the slit 10 may be provided. In the napkin for night use, since the length of the absorber is shorter on the front side than the rear side from the body fluid discharge part, the bent part 10 is preferably provided at least at the front end of the slit 10 in order to prevent body fluid leakage from the front side. . Moreover, as shown in FIG. 11, the slit 10 may be formed in a bead shape in which circular shapes are connected in the longitudinal direction. As a result, wide portions and narrow portions are alternately formed, and the narrow portions serve as stoppers to reduce the twist due to leg pressure.

As shown in FIG. 1, the position where the slit 10 is provided with respect to the absorbent body 4 is in the middle of the napkin longitudinal direction, and at least the range in the napkin longitudinal direction corresponding to the body fluid discharge portion of the wearer. Then, it is formed in the range of the napkin longitudinal direction including the wing-shaped flap W. Further, as shown in the illustrated example, it is preferable that the front side in the longitudinal direction of the napkin is formed in a range that is in front of the body fluid discharge portion corresponding region H and does not reach the front end edge of the absorbent body 4. forming against the rear side of a rear from the body fluid discharge end corresponding region H, which does not reach the rear edge of the absorbent core 4, to a position or a position near the hip hold flaps W _B is the maximum width It is preferable to do this. As a result, it is possible to reliably prevent the side leakage of body fluid diffused before and after the body fluid discharge portion.

  As a specific arrangement position of the slit 10, as shown in FIG. 1, the separation width A from the side edge of the absorbent body 4 prevents leakage of body fluid and improves the visual effect after use. Therefore, the thickness is 5 to 30 mm, preferably 10 to 25 mm. Further, the separation width B between the slits 10 and 10 on both sides is 20 to 70 mm, preferably 30 to 60 mm in order to secure a body fluid diffusion region in a certain width direction inside the absorber. The slit 10 is preferably formed at a position that coincides with the inner edge of the side nonwoven fabric 7 or in the vicinity thereof, or at an inner position from the inner edge of the side nonwoven fabric 7. As a result, the body fluid that travels on the surface of the sanitary napkin 1 surely enters and is dammed into the concave groove 11 to be described later, so that side leakage of the body fluid can be reliably prevented. Moreover, as the position of the slit 10 in the front-rear direction, as shown in FIG. 1, the length C in the longitudinal direction of the napkin between the front end of the slit 10 and the front end of the absorber 4 is 20 to 60 mm, preferably 30. The length D in the longitudinal direction of the napkin between the rear end of the slit 10 and the rear end of the absorber 4 is 20 to 100 mm in the case of the sanitary napkin 1 which is a night napkin, Preferably it is 40-80 mm.

  The width E of the slit 10 is 0.5 to 5.0 mm, preferably 1.0 to 3.0 mm, and the length F of the slit 10 is 120 to 300 mm, preferably 140 to 280 mm. It is good.

  As shown in FIG. 5, the concave groove 11 is formed in the slit 10 from the surface side of the second sheet 6 in a state where the second sheet 6 is laminated on the skin side of the absorbent body 4 on which the slit 10 is formed. By embossing, only the second sheet 6 may be formed along the inner surface of the slit 10, or as shown in FIGS. 2 and 3, the absorption in which the slit 10 is formed. In the state where the second sheet 6 and the liquid-permeable surface sheet 3 are laminated on the skin side of the body 4, the liquid-permeable surface sheet is embossed into the slit 10 from the surface side of the liquid-permeable surface sheet 3. 3 and the second sheet 6 may be formed along the inner surface of the slit 10. In the former case, the second sheet 6 and the liquid-impervious back sheet 2 are integrated by thermocompression bonding in the slit 10, and in the latter case, the liquid-permeable surface sheet 3, the second sheet 6 and By having a structure in which the liquid-impermeable back sheet 2 is thermocompression-bonded and integrated, concave grooves 10 are formed on both sides on the surface side of the sanitary napkin 1, and body fluid that flows in the width direction along the surface is formed. It can flow into the concave groove 10 and can be dammed, so that side leakage can be surely prevented.

  In addition, when the said absorber 4 is enclosed by the covering sheet, the covering sheet which covers the front and back of the absorber 4 between the said second sheet 6 and the liquid-impermeable back sheet 2 in the bottom face of the said groove 11 Comes to intervene.

  Embossing for forming the concave groove 11 is applied to the slit 10 of the absorber 4. That is, the second sheet 6 is squeezed by the embossing that forms the concave groove 11, and the absorbent body 4 is not directly squeezed. In short, the emboss for forming the concave groove 11 is formed in the slit 10 by an embossed convex part having a bottom surface smaller than the size of the slit 10. As the size of the bottom surface of the groove 11, the width is 0.5 to 3.0 mm, preferably 1.0 to 2.0 mm, and the length is 120 to 300 mm, preferably 140 to 280 mm. It is good to do.

  By forming the concave groove 11, the end surface (side surface of the slit 10) of the absorbent body 4 divided in the width direction in the slit 10 is covered with at least the second sheet 6 in the cross-sectional view shown in FIG. 3. At the same time, at least the second sheet 6 and the liquid-impermeable back sheet 2 are joined at the bottom surface of the groove 11.

  As the second sheet 6, any one having hydrophilicity with respect to body fluids or one having water repellency can be used. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. By using fibers, a material having water repellency can be used. Further, as will be described in detail later, it is possible to impart a desired property to a region having water repellency and a region having hydrophilicity by surface treatment with a hydrophilic agent or a water repellent agent according to the property of the material. is there. The second sheet 6 is not limited as long as it has a fiber layer, but a non-woven fabric is preferably used as it is. There are various types of nonwoven fabrics such as spunlace nonwoven fabric, spunbond nonwoven fabric, melt blown nonwoven fabric, needle punched nonwoven fabric, and air-through nonwoven fabric. Desirably, if importance is attached to the diffusibility of body fluid, a spunbonded nonwoven fabric is desirable.

  In the example shown in FIG. 3, the second sheet 6 is composed of one continuous sheet straddling the slits 10, 10 on both sides, and the water repellent region 12 in which the portions forming the concave grooves 11 on both sides have water repellency. In addition, the portion located between them is a hydrophilic region 13 having hydrophilicity. More specifically, in the second sheet 6, it is preferable that the entire inner surface of the concave groove 11 is a water-repellent region 12. In the illustrated example, the water-repellent region 12 is formed in the entire width of the concave groove 11 and in a range extending on both sides of the sanitary napkin 1 in the width direction. The width of the water-repellent region 12 formed on the second sheet 6 is 10 to 40 mm, preferably 15 to 30 mm. The relationship between the width of the water-repellent region 12 formed on the second sheet 6 and the width of the slit 10 is preferably slit width ≦ the width of the water-repellent region 12.

  When the second sheet 6 is composed of a single sheet straddling the slits 10 and 10 on both sides, the second sheet 6 can be easily conveyed and aligned with other members. Therefore, in the manufacturing process of the sanitary napkin 1 Is easy to handle.

  Further, when the second sheet 6 is composed of a single sheet, a hydrophilic region 13 is formed between the water-repellent regions 12 and 12 on both sides. And the penetration of body fluid absorbed from the liquid-permeable surface sheet 3 to the absorbent body 4 is promoted in the hydrophilic region 13 between them. Accordingly, the amount of body fluid flowing on the surface of the sanitary napkin 1 is reduced, and the discharged body fluid is quickly absorbed by the absorber 4 in the central region in the width direction, so that the body fluid diffuses inside the absorber 4. become.

  In the second sheet 6, it is preferable that the hydrophilic region 13 is formed in a portion extending outward in the width direction from the slit 10. Thereby, even when the bodily fluid flowing through the body or flowing on the surface of the napkin flows over the water-repellent regions 12 on both sides outward in the width direction, the bodily fluid can be transferred to the absorbent body 4 at the hydrophilic portion. It becomes like this.

  The water-repellent region 12 may be provided at least in a range where the concave groove 11 is formed with respect to the longitudinal direction of the sanitary napkin 1, but the water-repellent region 12 may be formed in a range longer than the longitudinal direction of the napkin. preferable. Further, when the second sheet 6 is disposed over almost the entire length of the sanitary napkin 1, the water-repellent region 12 may be formed over the entire length of the second sheet 6, or the slit 10 may be only the longitudinal range covering 10, and the outside in the longitudinal direction may be the hydrophilic region 13. In addition, when the second sheet 6 is disposed with a length that covers the slit 10 that substantially matches the length of the slit 10, the water-repellent region 12 is preferably formed over the entire length of the second sheet 6. .

  The water-repellent region 12 of the second sheet 6 only needs to be arranged so that the body fluid migration from the inner side to the outer side in the width direction can be inhibited in the slit 10, and as shown in FIG. However, as shown in FIG. 3, it is preferably formed on the entire inner surface of the groove 11. Since the entire surface along the inner surface of the concave groove 11 has water repellency, the second sheet 6 having water repellency can surely prevent body fluid from diffusing outward in the width direction from the slit 10. On the other hand, when only one side surface of the groove 11 is made water-repellent and the other side surface is made hydrophilic, the body fluid that diffuses the surface side of the liquid-permeable surface sheet 3 and flows into the groove 11 is hydrophilic. It becomes easy to be absorbed from the surface on the side having the property. Further, when only one side surface of the groove 11 is water-repellent, it is preferable that only the side surface on the outer side in the width direction is water-repellent as shown in FIG. The side surface on the inner side in the width direction is a portion having the hydrophilic property of the second sheet 6 or the second sheet 6 is not disposed, whereby the range in which the absorber surface becomes hydrophilic in the center region in the width direction is expanded, and the absorbent body is wide. The range can be utilized for absorption of body fluid, and the absorption efficiency of body fluid can be improved.

  Next, the structure which makes the predetermined area | region of the said 2nd sheet | seat 6 water-repellent is demonstrated. As shown in FIG. 2 and FIG. 3, the first configuration is made of a synthetic fiber nonwoven fabric and uses a continuous sheet straddling the slits 10, 10 on both sides, and the water-repellent region 12 is subjected to a special treatment. Using the water repellency of the material itself, the hydrophilic region 13 can be made hydrophilic by applying a hydrophilic agent. As the hydrophilizing agent, in consideration of safety to the human body, safety in the process, etc., nonionic active agents added with ethylene oxide such as higher alcohols, higher fatty acids, alkylphenols, alkyl phosphate ester salts ( Octyl, dodecyl), anionic surfactants such as alkyl sulfates, etc. are preferably used alone or in a mixture, and the amount applied to the sheet varies depending on the required performance, but is usually based on the dry weight of the target sheet About 0.1 to 2.0 wt%, particularly about 0.2 to 1.0 wt%.

  As a 2nd structure which makes the predetermined area | region of the said 2nd sheet | seat 6 water-repellent, as shown to FIG. 7 (A), it consists of hydrophilic fiber, and the base material sheet 6a which extends across the slits 10 and 10 on both sides is continuous. And a water-repellent sheet 6b bonded to the water-repellent region 12 of the base sheet 6a by a bonding means such as an adhesive such as hot melt, heat seal, or ultrasonic seal. In this configuration, by utilizing the water repellency / hydrophilicity of the material itself, desired properties can be obtained without any special treatment.

  As a third configuration for making the predetermined region of the second sheet 6 water repellent, as shown in FIG. 7B, water repellent sheets 6c, 6c respectively disposed on the slits 10, 10 on both sides, The hydrophilic sheet 6d positioned between them can be bonded by an adhesive such as hot melt, or a bonding means such as heat sealing or ultrasonic sealing. As the water-repellent sheet 6c, a water-repellent material or a water-repellent material can be used. As the hydrophilic sheet 6d, a hydrophilic material or The thing etc. which performed the hydrophilic treatment can be used.

  As a fourth configuration in which a predetermined region of the second sheet 6 is water-repellent, as shown in FIG. 7 (C), two water-repellent sheets 6e and 6e respectively covering the slits 10 and 10 on both sides are provided. Thus, the water-repellent sheets 6e and 6e on both sides can be separated from each other. As the water repellent sheet 6e, it is possible to use a water repellent material or a water repellent treatment. Accordingly, diffusion of the body fluid in the width direction outward side in the slit portion can be surely prevented, and the water-repellent sheets 6e and 6e on both sides are separated and the second sheet 6 is not interposed. Transfer of the body fluid to the absorber 4 can be performed smoothly.

  As shown in FIG. 8, the second sheet 6 according to the fourth configuration may be arranged so as to cover only the side surface on the outer side in the width direction of the slit 10. As this processing procedure, as shown in FIG. 8 (A), a second sheet 6 having water repellency that is biased outward in the width direction is arranged on the upper surface of the slit 10 and shown in FIG. 8 (B). As described above, by compressing the position of the second sheet 6 closer to the inner side in the width direction, the side surface on the outer side in the width direction of the slit 10 is covered by the inner portion in the width direction of the second sheet 6.

By the way, the second sheet 6 used in the present invention is formed with a thickness of 0.5 to 10 mm, preferably 1 to 7 mm, more preferably 1.5 to 4 mm so as to be relatively bulky as compared with a normal sheet. It is preferable to do this. By making the second sheet 6 relatively bulky, body fluid can easily pass through the second sheet 6, and the discharged body fluid is quickly absorbed by the absorbent body 4 at the center in the width direction, thereby reducing body fluid flowing on the surface. become able to. Further, by increasing the thickness of the second sheet 6, the ratio of the second sheet 6 existing in the slit 10 when the concave groove 11 is formed is increased, so that the state in which the slit 10 is opened can be easily maintained. 10 is less likely to occur. Furthermore, since the nonwoven fabric has higher cushioning properties than the absorbent body, the rigidity of the slit portion is larger when the ratio of the second sheet 6 in the slit 10 is larger than the state where the openings of the slit 10 are closed and the absorbent bodies on both sides are close to each other. Becomes low, it is easy to follow the body, and it becomes easy to wear. The thickness of the second sheet 6 is a numerical value when the pressure between the pressing surfaces is 0.1 kPa measured using a handy compression tester (KES-G5) manufactured by Kato Tech. Moreover, in order to absorb the discharged | emitted body fluid quickly, it is preferable as the said liquid-permeable surface sheet 3 to use the apertured film which a body fluid permeate | transmits easily. The fineness of the fibers constituting the second sheet 6 is 2.2 to 6.7 dtex, preferably 3.3 to 5.6 dtex. The basis weight of the second sheet 6 is 18 to 60 g / m ² , preferably 25 to 40 g / m ² .

  The slit 10 may be continuously formed in a predetermined longitudinal range along the longitudinal direction of the sanitary napkin 1 as shown in FIG. 1, or as shown in FIG. You may form discontinuously in which the discontinuous part 14 of the 1 or several slit was formed in the middle. When formed continuously, the body fluid can be prevented from diffusing outward in the width direction continuously in the longitudinal direction of the napkin, while the absorbent is in a long range in the longitudinal direction of the napkin. Therefore, there is a concern that the opening of the slit 10 is likely to close when receiving leg pressure or the like from the both sides in the width direction toward the inward side during mounting. On the other hand, by forming the slit 10 discontinuously, the slit 10 is reinforced by the discontinuous portion 14, so that the opening of the slit 10 can be prevented from closing. In the case of the discontinuous slit 10, the concave groove 11 is also preferably formed discontinuously separated by the discontinuous portion 14. Since the discontinuous portion 14 becomes a passage for bodily fluids, it is preferable not to provide at least the bodily fluid discharge portion and the vicinity thereof. The discontinuous portion 14 is preferably provided with an interval of about 5 mm to 15 mm with respect to the longitudinal direction of the sanitary napkin 1. When it is narrower than 5 mm, the body fluid blocking effect is reduced, and when it is wider than 15 mm, the slit reinforcing effect is reduced.

[Other examples]
In the above embodiment, the inner side of the side nonwoven fabric 7 was bonded to the liquid-permeable surface sheet 3, but the inner side of the side nonwoven fabric 7 was folded back almost double, and inside the double sheet, A three-dimensional gather in which one or a plurality of thread-like elastic elastic members fixed at both ends or at appropriate positions in the longitudinal direction are arranged in the middle portion in the height direction, and the double sheet portion is erected on the skin side by the contraction force May be formed.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Impervious back sheet, 3 ... Impervious surface sheet, 4 ... Absorber, 6 ... Second sheet, 7 ... Side nonwoven fabric, 10 ... Slit, 11 ... Concave groove

Claims (6)

In an absorbent article in which an absorbent body is interposed between the liquid-permeable surface sheet and the back sheet, and a second sheet is disposed between the liquid-permeable surface sheet and the absorbent body,
A slit penetrating in the thickness direction along the longitudinal direction is formed on each side portion of the absorbent body including the body fluid discharge portion corresponding region, and the second sheet is disposed along the inner surface of the slit. And a concave groove in which the second sheet and the back sheet are integrated in the slit,
In the second sheet, at least a portion forming one side surface of the concave groove has water repellency, a portion forming the concave groove on both sides has water repellency, and a portion located between these portions It is composed of a continuous sheet straddling the slits on both sides having hydrophilicity, or a water repellent sheet disposed in each of the slits on both sides and a hydrophilic sheet positioned therebetween are joined and integrated. An absorbent article comprising a sheet .   2. The absorbent article according to claim 1, wherein the second sheet has water repellency at a portion forming the entire inner surface of the groove. The absorbent article according to claim 1 , wherein a portion of the second sheet that extends outward in the width direction from the slit has hydrophilicity. In the concave groove, the liquid-permeable surface sheet and the second sheet are disposed along the inner surface of the slit, and the liquid-permeable surface sheet, the second sheet, and the back sheet are integrated in the slit. Item 4. The absorbent article according to any one of Items 1 to 3 . The absorbent article according to any one of claims 1 to 4 , wherein the second sheet has a thickness of 0.5 to 10 mm. The absorbent article according to any one of claims 1 to 5 , wherein the slit is formed continuously along the longitudinal direction or is formed discontinuously having a discontinuous portion in the middle of the longitudinal direction.

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